The chair can lock every 90°, it is safer and more stable, so you don’t have to worry about losing control when rotating. It can be rotated 360°, so the elderly can easily leave the dining table when sitting on the chair without having to push the chair back or move it out. The triangular easy-grip armrest design is suitable for people with weak grip strength and can be used as support when sitting, standing, rotating, and standing up. Spacious seat cushion and backrest, more comfortable and stable Suitable for those who are weak and have difficulty standing